JuliusK

I also stumbled upon them, thanks for mentioning them.

Thanks for sharing that, it's good to know that the support can be counted on. Definitely leaning towards them.

That's good to know, appreciate the info.

Afternoon all, Could anyone recommend any trust worthy 3rd party companies that are able to repair Pylontech batteries that are no longer in warranty. I would need someone to look at my 4 batteries and tell me if they are salvageable, perhaps build 2 out of 4? Thanks,

What a BMS should do and what a BMS actually does or what a inverter listens to is a mystery to me. So like you I understood the BMS to be the mechanism by which the inverter is controlled that then charges or discharges the batteries to the appropriate level. So if something is outside a set of parameters the BMS should prevent the batteries being damaged. But for what ever reason they do not seem to be doing their intended task. As in my scenario my batteries were being over charged, the Sunsynk inverter charge settings were only ever to be used if the bms was not available. There were 16k over charge logged error on the batteries yet the batteries continued to work, they never went into protected mode not once.

Thank you, I will add BSL to my list of companies to investigate. I've never actually heard of them before.

Morning all, So after my last 4 Pylontech us3000c were a complete write off, I am now going to be shopping around for a new battery system. This time around, support, support, support is going to be key focus. So at the moment I have two possible brands lined up as possible replacements, I'm only going to start with one 5kwh battery at the moment as this year has already been very expensive. Freedom Won eTwower 5kwh - manufactured in South Africa, the company has been around for a long time, they have a lot of installs. Greenrich UP5000 - manufactured in South Africa, it's a relatively new company, they seem to be popular because of their price point. I would really appreciate any feedback on Freedom Won and Greenrich batteries plus any other batteries anyone can recommend that they have been running for 7+ years? What I'm really after is good local support and batteries that are up to the task to be used daily (at night mostly) so I can carry over my solar production into the evenings. Thank you,

A bit more of a complete answer. I had Segen support connect to the batteries remotely and pull the logs via Battery View, they state because of the over voltage errors and that the batteries have swollen the OEM (Pylontech) will not honor the warranty. My argument was that there were no visible error presented to me at any point in the last 5 years so that I could correct anything. The batteries never went into safe mode, there were no errors logged on the Sunsynk inverter. They stated that because of one setting that was disabled in the Sunsynk inverter that is why no error were ever logged, the settings in question is "BMS_Err_Stop - When it is active, if the battery BMS failed to communicate with inverter, the inverter will stop working and report fault." Every time I looked at my inverter and it was often, the BMS was working correctly all info was being displayed in the Sunsynk LiBMS screen. Segen's Support then states that the error were transient and because the BMS_Err_Stop was not enabled, the BMS communication issue would clear it's self and I would not see it on the panel. Even though Pylontech battery BMS does have over voltage protection and over charge protection built in? So essentially 4 Pylontech us3000c batteries down the drain.

The battery in question has swollen and Segen / Pylontech are refusing the warranty. Seems like 3/4 batteries have swollen, even though there is communication between the inverter and the batteries. I'm at a loss for words.

Thanks for the suggestion, I'm going to get him to test the voltage. I'll check the batteries for older log files too.

The installer is coordinating all of this for me with the supplier. If they throw this out, then what's my options? If the inverter doesn't listen to the libms, go to Sunsynk?

Morning, I'm waiting for response from Segen after I submitted my rma paperwork with all the log files from the batteries. Have you used Solar Diety for any pylontech work? They claim to be the authorised pylontech repair center for South Africa?

That's correct, it was due to the wrong firmware being installed by the manufacturer during an upgrade. Something is not right since the battery is asking something and not getting it.

Most of my batteries are in a high voltage state or an OV state. Is there anything that I can do to reduce that or it's a bms thing?

SA has two USB cables, one that goes to the inverter and a second that goes to the console port of the master battery. However I do not know which data is being plotted on the graph, the average of all 4 batteries or the inverter values. The additional USB to the batteries does give the ability to see the individual batteries SOC, voltages etc. I'm going to get the installer involved tomorrow.

Thanks for clarifying the settings for me. I was worried. I'm going to open a RMA case for battery 2. I took all of the log files (both events and history for each battery) and ran them through claude.ai and the analysis I got back is not positive. According to to claude this is the executive summary of my battery bank. Battery 1 is the best of the bunch with only a cell imbalance, battery 2 has complete BMS failure (plausible), battery 3 identified cell 10 over-voltage, battery 4 critical cell 14 over voltage. So I don't know if is accurate or just ai hallucinations. The report reads like a Stephen King novel. Attached is my battery voltage for the last year and 1 month. On the 1 month graph you can see a definitive change, this is exactly when battery 2 dropped to 7% SOC the first time.

Morning @Tinbum and @Nexuss , thanks again for the above analysis. I've went and gotten all the logs from the other 3 batteries (so 4 in total). Looking at the logs this morning it seems that even with the new floating voltage alot of the cells are reporting as high and I am seeing OV and HV warnings / errors. I think one of you clarified this for me yesterday but just that I understand correctly, if I am using LiBMS this should request / override any settings in the battery settings pages such as the float voltage and charge current? All my charge current on the inverter is set well below the max. Is there a voltage setting that is still affecting the charging of the batteries? Which settings affect the OV and HV issues that I am getting? Some additional info regarding my battery bank. Battery 1 is the newest yet it cycles a lot more than the others, it was bought about 3 years after the initial 3 batteries, it is also the master. Software version 24-07-01. Battery 2 is the current trouble child. Software version 24-07-25. Battery 3 currently working as expected. Software version 24-07-25. Battery 4 currently working as expected but the main board was replaced late last year as it just packed up one day. Software version 24-07-01. I also had to send in all of my configuration screenshots from my inverter and photos of my install for the RMA, at which point no issue was raised about my floating voltage either. All battery software was upgraded by Segen last year. They stated that even though I have the same batteries because of different main boards etc the software versions are the latest / correct for that board and battery. An observation, all the batteries are exhibiting some kind of error / warning OV/HV. These errors are only visible via a specialised cable and via non-publicly available software (you can't just download it from the website). The errors are not surfaced via the inverter, or via the warning light and signal on the batteries themselves. The standard monitoring app doesn't even show individual battery status / level. I could only see the level of my individual battery dropping because I have extra monitoring software (Solar Assistant) and I have the special cable for more detailed info. So how is a normal user supposed to know something isn't right? When the system was setup by a legitimate installer, checked by an electrical engineer (for safety sseg). Attached is the zip file with all of batteries event and history logs. Appreciate any further input. Thanks and regards, J logs-08022026.zip

Thanks very much for the analysis. I would have never stuck the logs in Ai. That's brilliant use of it. I'm going to open up a ticket with Segen and get this looked at. Appreciate the assist.

Updated my capacity to 296Ah. Thanks for the offer. Attached is the events and history log file. History is over 3mb so I had to zip it. event_20260207091159.txt .history_20260207091211.zip

Morning, thanks for all the info last night. My apologies, I sent an old photo where I only had 3 batteries and my capacity does appear wrong for 4 batteries. Here is the current and fresh photo. What is the difference between the Charge and Discharge Amps on the "Batt type" screen and the "Batt charge" screen? Yes, I disabled work mode timer and let it sit till last night. Tried to run the batteries over night and again it dropped down to 6% this time. LiBMS screen attached. As far as I can see it's communicating OK. How do you get a list of historic errors from BatteryView? I cannot seem to find that option. Will run a load test this afternoon once they batteries have charged back up.

Thanks, my battery firmware was updated last year it's a mix of v2.4 and v3.0. Just had a look at the status again of all the batteries and they are now all allegedly fine. This was before I changed the float voltage.

Thanks, I'll go get that adjusted. Will also investigate the logs. Which is the better float voltage for the longevity of the battery, 52.8v?

Yes, all screenshots were taken with a minute of each other. Should the voltages be identical on all or should they be just close enough?

What would be the best way to do that. Would I just run a bunch of things at the same time i.e. geyser and pool so there is some load and watch what happens?

So below is my configuration for my inverter for the battery charging, but everything is controlled by the BMS.